What is an IMEI number and what is it for?

@Peter, sorry to correct you, but you are 100% dead wrong A device with 2 SIM slots can have 0, 1 or 2 IMSIs, depending on how many SIM cards

Information found on the TV sticker 1) Model name 2) Serial number 3) Newer Xperia devices have the IMEI number inside the SIM card slot on a

imei slot 1 and 2 One for each SIM , it'll still show you the number even if the slot's not

imei slot 2 Looking at the imei parameters I noticed that the imei sv is: unknown, slot 2 nano sim imei sv: 01 works very installed a